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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cef692d8ea1d59f3786b313ec4c99798c4e7512f78b54d2447a86d76ce3b054' 
  AND token = '8AJkcazxkCmRbd0mhJrGe0Kth/eUEt1+mXKhA2LR4gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}